Beneficial Functions of Middleboxes

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Document Type Expired Internet-Draft (individual)
Last updated 2017-12-03 (latest revision 2017-06-01)
Replaces draft-dolson-plus-middlebox-benefits
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Expired & archived
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IETF conflict review conflict-review-dolson-transport-middlebox
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document summarizes benefits that operators perceive to be provided by intermediary devices that provide functions apart from normal IP forwarding. Such intermediary devices are often called "middleboxes". RFC3234 defines a taxonomy of middleboxes and issues in the Internet. Most of those middleboxes utilize or modify application-layer data. This document primarily focuses on devices that observe and act on information carried in the transport layer, and especially information carried in TCP packets. A primary goal of this document is to provide information to working groups developing new transport protocols, to aid understanding of what might be gained or lost by design decisions that may affect (or be affected by) middlebox operation.


David Dolson (
Juho Snellman (
Mohamed Boucadair (
Christian Jacquenet (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)